The evolution of arch filament systems and moving magnetic features around a sunspot

Context. Arch filament systems (AFSs) are usually considered as the chromospheric manifestations of the emerging flux regions (EFRs) seen in Ha observations. Moving magnetic features (MIMEO look similar to EFRs in magnetograms, but often appear in the decaying phase of an active region (AR) and behave differently from EFRs. A possible relation between AFS and MMF would be important for revealing a common mechanism for building up basic structures on the Sun. Aims. Based on Ha and magnetic field observations with high spatial resolution, we study the evolution of MMEs around a sunspot, as well as their related AFSs from birth to death. Methods. The multiwavelength observations from the New Vacuum Solar Telescope (NVST) and the Solar Dynamic Observatories (SDO) are co-aligned in the spatial and the temporal sense. MMEs appeared near the northern end of a light bridge (LB). Their related AFSs were carefully identified and traced from their appearance to disappearance based on H alpha, EUV data, and magnetograms. Results. In the main sunspot of AR NOAA 11711 during April 1-4, 2013, many slow-speed MMFs with a polarity opposite to that of the sunspot appeared from the close vicinity of the northern end of a LB. Different from other smaller MMFs around the sunspot, these MMEs were always related to arch filaments and eventually formed AFSs with three twisting branches. The total flux involved in the AFSs was estimated to be about 2.7 x 10(21) Mx. The largest MMF M1 evolved into a small pore that led to an intensity reduction in the continuum intensity images. The appearance and evolution of the AFSs near the sunspot seems to be controlled by MMFs emanating from the penumbra. Owing to continual magnetic cancellation between the MMFs and their surrounding opposite flux, the AFSs gradually disintegrated and finally disappeared. Conclusions. The appearance and evolution of the near the sunspot seem to be controlled by these MMEs emanating from the penumbra.